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Q. A. GILMORE Limestone Cutter.

No 25,254. PatentedAug. 30, 1859.

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QUINCY A. GILLMOBE, OF NEW YORK, N. Y.

MACHINE FOR CUTTING AND SCREENING BITUMINOUS LIMESTONE 0R ASPHALT.

To all whom it may concern:

Be it known that I, QUIN Y A. GILLMoRn, of the city, county, and Stateof New York, have invented a new and useful machine, called the rotaryasphalt cutter for cutting up and screening asphalt in the proc-= ess ofmanufacturing bituminous mastic; and I do hereby declare that thefollowing is a full, clear, and exact description of the constructionand operation of the same, reference being had to the annexed drawings,making a part of this specification, in which- Figure 1 is a side view,Fig. 2 an end view, looking toward the end to which the screen isattached, and Figs. 3 and 4, perspective views of the knives or cutters,forming a part of the machine.

The machine consists, essentially, of a cylinder or drum a, Figs. 1 and2, arranged for rotating upon a horizontal axis P, Fig. 2, andfurnished, on its exterior cylindrical surface, with a number of curvedknives, or cutters 6, Figs. 1, 2, 3 and 4, radiating from thecylindrical surface, and kept in position by keys 0, Figs. 1 and 2. Fromthe curved edges of these knives b, the asphalt after being cut, isdischarged along the concave surface of the said knives, on that sidetoward which the curved points are directed. These knives, or cutters, bare arranged on raised bands or threads which run around the cylinder a,in the manner of spirals, either continuously, from one head of thecylinder to the other, as indicated in Fig. 2, or, in branches springingfrom the middle circle of the cylinder 64, and running respectively indiverging spirals toward the two heads of said cylinder.

Arrangements to reduce the friction, and prevent the clogging of thecutters (when it is desired to set the knives to cut fine) may be madeby scooping out short grooves in the cylinder, running diagonallybackward from that side of the knives where the cuttings are discharged.In coarse cutting, these grooves would be unnecessary. They arerepresented at s Fig. 2.

The machine is fed from a spout or trough (Z Fig. 1, arrangedhorizontally, or nearly so, at a convenient height, with one end restingnearly in contact with the cylinder a. This spout is supplied with alongitudinal bar 6, Fig. 1, which can be worked to and from the cylinderby means of rack teeth f, Fig. 1, which work into corresponding teeth ofthe pinion wheel 9, Fig. 1, on which said bar rests. This pinion wheel9, is turned by a hand wheel or crank h Fig. 1, attached outside of thespout.

The end of the bar 6, next the cylinder at, is furnished with a metalplate, or feeder c', Fig. 1, set at right angles to the bar 6, and thespout cZ. By turning the handwheel h, the feeder may be pressed againstthe asphalt, so as to force the latter against the cutters Z), Z), onthe cylinder. Under the cylinder, at a suitable inclination, a screen7', Figs. 1 and 2, is arranged, for separating the coarse cuttings, fromthe powder or fine cuttings. In order to give motion to this screen j,the axis P of the cylinder a, is prolonged outside of the frame whichsupports it. Upon this axis, and at right angles to it, three pins 7::or a triangular block with projections serving as pins, Figs. 1 and 2,are placed, which pins, by working against the top surface of one end ofa lever Z, Fig. l, which moves in a vertical plane upon the fulcrum r,Fig. 1, communicates to the other end of said lever Z, a verticalmotion, alternately up and down. This end of said lever Z, is connectedby the rod 25, Figs. 1 and 2, with one end of an elbow piece or hellcrank lever m Figs. 1 and 2, pivoted at the angle n, Fig. 2, so as torestrain its motion within a vertical plane, parallel to the axis ofthecylinder a. The other end of the elbow piece or hell crank lever m,is attached by the link 11), Fig. 2, to the screen, at 0, Figs. 1 and 2.Bythis means a horizontal motion, to and fro, is given to the screen.Motion is given to the machine by any suitable attachment to the axis P,to which the cylinder, carrying the knives, is attached.

Having thus described the construction and operation of my machine, I donot claim therein, separately considered, the arrangements for feedingthe machine, or the device for communicating motion to the screen, andthe form of the screen itself; but

What I do claim as new, and desire to secure by Letters Patent, is

1. The rotary cylinder, or drum a, carry ing knives or cutters b, b,substantially of the form described, arranged in rows, either with orwithout the raised bands, substantially as represented, or, in rowsparallel or to the purpose of cutting and screening asoblique to theaxis of the cylinder for cutphalt, or bituminous limestone.

tin as haltsometimes known under the nari le i f bituminous limestonesubstan- QUINCY GILLMORE' 5 tially as described. l/Vitnessesz 2. I alsoclaim the application of the ma- JOSEPH G. GILBERT, chine as a Whole,substantially as described, W. ANDERSON.

